Channel information feedback method, communication apparatus, and communication system

Abstract

A channel information feedback method. The method can be applied to a first wireless device, and includes: receiving a first message from a second wireless device, where the first message notifies channel information measurement, the first message carries first indication information related to the first wireless device, and the first indication information indicates a feedback condition; performing channel information measurement based on the first message; determining a first channel information variation based on currently measured channel information and historically measured channel information; and feeding back a measurement report to the second wireless device when the first channel information variation meets the feedback condition.

What is claimed is: 
     
         1 . A channel information feedback method, applied to a first wireless device, the method and comprising:
 receiving a message from a second wireless device,   wherein the message notifies channel information measurement,   the message carries first indication information related to the first wireless device, and   the first indication information indicates a feedback condition;   performing channel information measurement based on the message;   determining channel information variation comprising a first channel information variation based on currently measured channel information and historically measured channel information;   wherein the first indication information comprises either a first sensitivity level, or a sensitivity level range; and   feeding back a measurement report to the second wireless device when the first channel information variation meets the feedback condition.   
     
     
         2 . The channel information feedback method according to  claim 1 ,
 wherein the first indication information comprises a first variation threshold, and   the feedback condition is that the channel information variation is greater than or equal to the first variation threshold,   or   the feedback condition is that the channel information variation is less than or equal to the first variation threshold.   
     
     
         3 . The channel information feedback method according to  claim 2 ,
 wherein the first indication information further comprises a first identifier,   the first identifier indicates a first channel information variation evaluation algorithm, and   the feedback condition is that the channel information variation is greater than or equal to the first variation threshold.   
     
     
         4 . The channel information feedback method according to  claim 2 ,
 wherein the first indication information further comprises a first identifier,   the first identifier indicates a second channel information variation evaluation algorithm, and   the feedback condition that the channel information variation is less than or equal to the first variation threshold.   
     
     
         5 . The channel information feedback method according to  claim 2 ,
 wherein the first indication information further comprises a second identifier that indicates an interval mapping algorithm, and   the determining the first channel information variation based on currently measured channel information and historically measured channel information comprises:
 comparing the currently measured channel information with the historically measured channel information to obtain a second channel information variation; and 
 processing the second channel information variation based on the interval mapping algorithm to obtain the first channel information variation, 
 wherein the first channel information variation is in a first interval, and 
 the first interval comprises the first variation threshold, 
 or 
 the first interval comprises the second variation threshold and the third variation threshold. 
   
     
     
         6 . The channel information feedback method according to  claim 1 ,
 wherein the first indication information comprises
 a second variation threshold and 
 a third variation threshold, and 
   the feedback condition is that the channel information variation is greater than or equal to the second variation threshold, and   the channel information variation is less than or equal to the third variation threshold.   
     
     
         7 . The channel information feedback method according to  claim 1 ,
 wherein, the first sensitivity level is related to a first variation threshold, and   the feedback condition is that the channel information variation is greater than or equal to the first variation threshold,   or   the feedback condition is that the channel information variation is less than or equal to the first variation threshold.   
     
     
         8 . The channel information feedback method according to  claim 1 ,
 wherein the first sensitivity level is related to a second variation threshold and a third variation threshold, and   the feedback condition is that the channel information variation is greater than or equal to the second variation threshold, and   the channel information variation is less than or equal to the third variation threshold.   
     
     
         9 . The channel information feedback method according to  claim 1 ,
 wherein the sensitivity level range comprises at least one sensitivity level, and   a variation threshold related to the at least one sensitivity level is used for determining the feedback condition.   
     
     
         10 . The channel information feedback method according to  claim 1 ,
 wherein the message comprises a null data packet announcement (NDPA).   
     
     
         11 . An apparatus, comprising:
 a processor; and a memory, storing instructions, which when executed by the processor, cause the apparatus to:   receive a message from a second wireless device,   wherein the message notifies channel information measurement,   the message carries first indication information related to the apparatus, and   the first indication information indicates a feedback condition;   perform channel information measurement based on the message;   determine channel information variation comprising a first channel information variation based on currently measured channel information and historically measured channel information   wherein the first indication information comprises either a first sensitivity level, or a sensitivity level range; and   feed back a measurement report to the second wireless device when the first channel information variation meets the feedback condition.   
     
     
         12 . The apparatus according to  claim 11 ,
 wherein the first indication information comprises a first variation threshold, and   the feedback condition is that the channel information variation is greater than or equal to the first variation threshold,   or   the feedback condition is that the channel information variation is less than or equal to the first variation threshold.   
     
     
         13 . The apparatus according to  claim 12 ,
 wherein the first indication information further comprises a first identifier,   the first identifier indicates a first channel information variation evaluation algorithm,   the first identifier indicates a first channel information variation evaluation algorithm, and   the feedback condition is that the channel information variation is greater than or equal to the first variation threshold.   
     
     
         14 . The apparatus according to  claim 12 ,
 wherein the first indication information further comprises a first identifier,   the first identifier indicates a second channel information variation evaluation algorithm,   the first identifier indicates a second channel information variation evaluation algorithm, and   the feedback condition is that the channel information variation is less than or equal to the first variation threshold.   
     
     
         15 . The apparatus according to  claim 12 ,
 wherein the first indication information further comprises a second identifier that indicates an interval mapping algorithm,   and the instructions cause the apparatus to:
 compare the currently measured channel information with the historically measured channel information to obtain a second channel information variation; and 
 process the second channel information variation based on the interval mapping algorithm, to obtain the first channel information variation, 
 wherein the first channel information variation is in a first interval, and 
 the first interval comprises the first variation threshold, 
 or 
 the first interval comprises the second variation threshold and the third variation threshold. 
   
     
     
         16 . The apparatus according to  claim 11 ,
 wherein the first indication information comprises
 a second variation threshold and 
 a third variation threshold, and 
   the feedback condition is that the channel information variation is greater than or equal to the second variation threshold, and   the channel information variation is less than or equal to the third variation threshold.   
     
     
         17 . The apparatus according to  claim 11 ,
 wherein the first sensitivity level is related to a first variation threshold, and   the feedback condition is that the channel information variation is greater than or equal to the first variation threshold,   or   the feedback condition is that the channel information variation is less than or equal to the first variation threshold.   
     
     
         18 . The apparatus according to  claim 11 ,
 wherein he first sensitivity level is related to a second variation threshold and a third variation threshold, and   the feedback condition is that the channel information variation is greater than or equal to the second variation threshold, and   the channel information variation is less than or equal to the third variation threshold.   
     
     
         19 . The apparatus according to  claim 11 ,
 wherein   the sensitivity level range comprises at least one sensitivity level, and   a variation threshold related to the at least one sensitivity level is used for determining the feedback condition.   
     
     
         20 . The apparatus according to  claim 11 ,
 wherein the first message comprises a null data packet announcement (NDPA).